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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e98bdca140f47f99c01aaa973a30974b96b6c4d9b8f3292cd0933a759f775f0' 
  AND token = 'pzkAMNj+SHpeab4Flq/ay5IRtyYNHG1kBPiLZ6EbFKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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