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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474b2d40937aa8a4269e1b28ce7e789ac5b3138d3115cf02ed6346104b78a4bd' 
  AND token = 'rCuLIYYrmUwYyOwzWcxfM8eXq75NXRH+tRv2mXnEwag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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