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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd026df089c6ed7d1bc31fdd15558ec825d5013f8c37b2dac295e17d57f927ba' 
  AND token = '5eENiMKrNS6BWNLdHVGkFcYfgWUUd7O+L1vT97PTaJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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