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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e955b53cf7cf62b0c8f6efb3266127788ba867bbb3ada05d587a00b383a611a2' 
  AND token = 'Xh97TSEuQmOwyu8dh5cbj9cdbuw0rv/u5xU2R0sJVEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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