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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadb526f968332ed87f340a8282ec9d5701df131f34e6dd2ea9e991dbf40d6b5' 
  AND token = 'c7uyVcP0GRpw6F7JBcvxvuEI18rh6RIvr0xs1pd8BN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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