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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf60e5c47557cf0b8e06e04c516e3f5305c1bbaed73b9476f161b023736693d0' 
  AND token = '84RTJgMvK6cxER4ovQvUq5DCYlHgReqC1XdrLc0xlVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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