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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35c00270c9bd0ef9856a18a4754b11a7273137fb21d588059c1394323ef27f8' 
  AND token = 'EBSwT+OqL5tphTm03DTs5WSTO6bd49Jfmc9R3QMoOfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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