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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5d5c093bd90c799eca955ec3cf7f622122d2113e09020d54bb9161e9cdf760' 
  AND token = '8fSeYHp1xL8poi6gE/LKONEy89WZjddArYhVnfD2ApA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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