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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6122d84097c19f260bc46bbc1eee30d4336e5f11839395536e98dc7c73e8229' 
  AND token = '7n3Q9yNnlFyJaCoEQH3Ry9r5gy/PKtJDU38pWTJy0rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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