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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5558f7cd134e64aa073459e1e626ee205ec715da7e9283bacb5e31fb4027df6a' 
  AND token = '6zNW1+ejxf0fcALjYWVdSYHzaC8EKg5S63I7TWMeTbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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