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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3db64f9f80317849673bd27eb941f0539e923006f967746135394a4371bd47' 
  AND token = 'UaND3Tw1tA+rk23898IKDUMhppTAr4mOwdVY2iBmm4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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