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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292aa6e16a42efc024589ae183d02853bbe15210c96dc28e7590ba5d22366e52' 
  AND token = 'qKiznkcAX3hdS4RDp1TUX5seROdGYA80lDNr3KvH7aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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