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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0330e35dc591add97b90245c96b9ea19975eb48363ec12cd925ef1c6aa58eac' 
  AND token = 'RFycLBdu7mdi9rv88QnaPD5858CTUIGkZvyBcIfmJbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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