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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39b9bd83d62e6ce0caa7ff4732f21008d40d20ee3032c34fb0388c364bfc861' 
  AND token = 'W+hE1IJhyon/W0A8Khbn8L23FVC45IeV5PaQwwMLtTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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