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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b82667fe62a61cec955c0fade9b41c179385201b1ec3537ab1d2c12401c1ea' 
  AND token = 'ahPvwxem0hTJJe4uAf2bZmORmGTl/oyMzjUX4CCmX8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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