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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1ce38306a84a89b5f02fce19cd71cfb5e0a1fcf844a6e80b3ef07573751b23' 
  AND token = 'N4V6QTfUDi0hFiijAeRr/FSqJM/KPWJZweadLAfJVsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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