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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8682eaf138cc920f9ebe49ab3410fe3ee11c43850455f5102767a41faced30d7' 
  AND token = '70T5DGO0XvZKIHeeUFTwX/Lx8PFlLalrjX/cbQOqz7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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