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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e16e847e71de27546a6de0e6cc6f4556b10dfb553e6dda16c5658dd23e7cfc0' 
  AND token = 'qodPpfnO49betaNrWCJjCiSGIxy9+krQbvm1H+Zmlk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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