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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85842459b0185e156667e13d190a34287a8efae535eaa5c45a01405030f6ff46' 
  AND token = 'Tia8kXMqdIJ6OefvcHDKhKKbrGQygydmJ4nNMgc73Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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