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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6997ada634452345732a64d9db2d07067a01f00557edca797f2726e3054665ca' 
  AND token = 'hSo+zvtmnWL+3QcHmdJ0/zox89s9xCusTU2KT4veEWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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