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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297a3b40b5861c700adc54f5cc517242eb2b00b748e52f78860721f9cd5119b7' 
  AND token = 'CVUZ1BEB2GAUJhInaGuOirJ3NTefs4Iz2tCfW2ZRXYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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