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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76a2219d2cacf5f47a35215b47f75a70328298a9c94353f26bc1572590e7e61' 
  AND token = 'zIZrlp3pOqdSl/iIJId1A5K0IaRZZMZWEfrzF6/maFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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