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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65bf59e256aa983a9b288b570489ccc929027db2eef0c5a156dde7d69c628b7' 
  AND token = 'J5x0XiHawMlumIfDosCuNyrW756MfvbTI/KoM0QBCjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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