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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb28770eb1f0f2ffd71a2d998abbd54d6792f29c87f8ac5a40fccceab1dadeb' 
  AND token = 'xbcp6VtjMbR7FsyGuIYnX4unHZ0Q1K/03akru+MKeQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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