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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3017f4fba051eb0503bae7111e0fafb47b74cc114d0c1428e1a9a40dfaa3d35' 
  AND token = 'BtaSglKwynDtCipm5rMqERZLY5UXX7WhrM9xc+zsu1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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