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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d311c467e98eed29b54cc3baaba347e7905b1f3fc1a3b31c3f01eb942cb32f' 
  AND token = 'XH6GZZyExT+iYooNo2lfck1vWmARHnnnVmHch5MZyFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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