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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdde152f5c655fe0f8f95b8d0ebb27ec7df91f7651e58b51f2887cd687c1f7b0' 
  AND token = 'AjDmjty/w9kx8FYaGhipUVt4tEWFhzhWRGwZHdycT98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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