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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a81ac0e437ed3bd038921a7a226245945f56161485c0f43e4c157e91230d331' 
  AND token = 'T7EWVjuI9Q7UPes5L+3K4spXlkkEwdoQknOvu8hNVs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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