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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda9599e823929f65765b5344faa9748b1acfd1ae2916d58aa49c53c5ae8e8cf' 
  AND token = 'p+AFuCw9leqPa1kPT8huSq3OZPByQdBC1at0YU1nbAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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