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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097857a7ba3ef6b5c29ccf5a2bae6368496db40e507855c26b40981189d601b8' 
  AND token = 'wgr1JrTTdlcssr3lBEkf8T2/na0SdgNl7D1zgRv2BQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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