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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb9066439bc5fd45fbcd8df18d9ff6c6f14887efeb8e4a3a6e125d619b12527' 
  AND token = 'pQZf6h26vkcuUaJDzzce/ezsuAMLhkwXPrEa4rXGcnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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