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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c50232d1ad8b43483d7cf2ab5d8a42841dbffa822261ab1d606a90a9e88e2f' 
  AND token = 'LESFyiONFYAW86mPY2WAZyw38Iqcca1IfCBSRtpLwt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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