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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db52de33c49fb8c90501e5477ea18ba087ce97bfd72473ef4cbea85303a7a67' 
  AND token = 's7x1XLlCxsEGp44pvtWk9l5ntFH7UpVTqfrM0gEEsLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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