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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea87fca37a9690c0308359c1a9ba6b5517165d139b8044bb10cff1a2278f07fe' 
  AND token = 'vQRQ48AJbAi0W/eytrHxE7uaUxx2cGxOlOVL7+wMzxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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