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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f527516906ae4a574bc081c28c324e280fbf7c97a7ff6f9a0b31aca11267153b' 
  AND token = '1KYCAPN3hEXxx6FRc7piu5xFU2ZHnEF81fN6Y/LTXtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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