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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e612f37641e28f5bf187ee06206d4e253e45de0096ab7fa7b985ec1d4eb53b5' 
  AND token = 'ef7VfEoul3KvYcQhH78l7qwkdK0oBZlZkGr4QGi1whg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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