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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6bef39780780c3c60c471bc42231fde0ec1431ea7cd80f43c5047321bb682e' 
  AND token = 'aaZ/I+Ub/BZEwQuRc/sG6PCx9ssjUcaYMOYZNlaWo20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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