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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6392e4a562019a156d38061720a36b9f524f229ae640a54bf5b36763b7310c' 
  AND token = 'VwlGx1Tjfp2B6qQF18FziedgAyfWkLb6QGx35AyZ5tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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