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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca6681efae2a150cf70782bfb711b0b7f34b92a781c0694d2418904f310ea64' 
  AND token = '8me1Hx/AFzBno57S/oNxSfU+RRyGewYTXnPXiXXbLaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}