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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79f143d645cddc8647668982f19121b64adc0d48eb3e1c553b1a5fc3f819367' 
  AND token = '8csdY8lMoxQIkhr4zVolCJFQgX6Neqml2HEGLnk6BP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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