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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba51115e6580244df2bec201e1ab72f74607b013c9ab1998535190765b11bac9' 
  AND token = 'x+lm1vzNOukUzeohxaKhppI0kXgEY8urGFQ2t6a4F24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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