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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2f8a6cdc3053beb37ec86c2dd00bb81aad75309d9e96c2a1660bd30d34e9e8' 
  AND token = 'PhetRmspPDcaQSaXSMQPvo94gPld16PlvOj/XvFo7Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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