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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d03957561357603177803543408fb944b1bab66b26d60ea0fcf24b61ca9a3d' 
  AND token = 'Srm3X5j7RkJk22eQ67vHsVxMueINXILc0BUXmdok3Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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