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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b01c579748312d171aeec192c7afc3aac05f8afed833ba9d4f4f5386738a9d' 
  AND token = '0NM93dcre7PDBorOME1Cf1ECHS85BWYV8JCPR8/fCrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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