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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ffd65abee918e9de187f56209843604ab8b95b1f243f705442c88fefc164628' 
  AND token = '2L3GZSaRxHyV2OPAQ8Cmb/FMLd9OcEffGXS5k3mBGJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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