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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6029cc5de5171fecfdc575b3f623045303a38db4a4d4ea50ef6c3b04a536db4b' 
  AND token = 'p8HfGJLRk8ITxECq6Saqn+q1UIkc5PC+3IUaEkWiD+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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