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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3004ca0b4468ce4db76a8005143f2926505b361802fdc51ee92143a0619eb4b2' 
  AND token = 'l64KWOGh3Vcl2novf7yPzsNntE/1I7wTUmwVe7ch4co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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