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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b9cfa664289fff9088686e4499bea6e1d6e3bb755b159b6c2ee2bad087e3d3' 
  AND token = 'Brw/WcE35APLGJXPqUabySgpMu14eMamdVQF/h6atmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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