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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc684cc9a2d54444c1dca0556b6fa1827496dd02ce64df8fec18e6f50efb0f76' 
  AND token = 'mUuMHaWg3JCUSRhpTa7UPWQQKUYo8rQsoUWp9En84tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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