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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b86d946fe14ef143b63b71c5123b1e3294b1b272777521dbc060694d78e24c6' 
  AND token = 'cl6chmYF4ufyVxJhO+eisyLVdXJxnYNGjGcGiSETPn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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