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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81149502b4902e2d41f898395975f3c5404d3531d0f50bba792e4da2241271ea' 
  AND token = 'N4lJpfKSQnOWt5lgFT/x8qGHfrur94P2GefEAMrZaVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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