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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f981a6668c1f5c0c13d66051b32a16032fa9b6337d84f543041c693b0901d45c' 
  AND token = '1VBepz+QRjnWCt6GehAcVO7Dp8focC5uv8CY8AyVlL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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