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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fe9be547ec21a6713e8af6984cdba2d4302501d81d0f221b9253c68853d9dd' 
  AND token = '8RDctnyuqc39oWvu6w90CfA/WKpc9R83MakpGZETLRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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