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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fa6589ebbe1dd9179555d422a2d5e4405287c2cf0cc57ef8a04cec3f8606a4' 
  AND token = '5SUQxDWFgVbWoev8mVbrQ5k5RbmLCtjsa3fXymcO7nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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