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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e8625605685cba28b1fe3894b599bb6cc6d2fd1f2987e55a3a110485f9d8bf' 
  AND token = 'IYguI5N0BhTJVwg6bVb9IePulmcgkKxOM4cO4k0SUts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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