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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4d9e796d214716b2a68587a3d86e916f0d3936082887d4eded70dab8c8ad84' 
  AND token = '40K6nHXs+z6raEZxXRtYP5kbLoGVhM1jSgO7Mp9jiEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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