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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d6abb52c217d8d29c894f8cc3576a4467f0279ab0b783824a4cc76a1e85139' 
  AND token = 'SI+aAiELsBjeC0N2VOu2C4MO9Lf+np3WTOILrgm+jGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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