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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3389019ba92891cd8f32f0290e518de78430faf67f68d40399289bf58343e3ab' 
  AND token = 'lRbtB5FNRIhVNmUEYKlWDMW6RQCnq4ZIuAtDbIBD8OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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